Question

I respectfully remind you sir, that we have been the most patient of all people. When you said we must have self-respect, I wondered how we could have self-respect and remain patient considering the treatment accorded to us through the years.

Which best explains why Robinson includes this description of Black people?
to warn the president that Black people are tired of waiting and will soon take action
to point out that Black people have greatly suffered for far too long
to assure the president that Black people would continue to wait patiently
to show that he respects the president and all he has done to help Black people

Answer 1

to point out that Black people have greatly suffered for far too long

Robinson emphasizes their long-suffering and questions how they can be expected to remain patient and self-respecting given the treatment they've endured.